Wood-preservative.



JUDSON A. DE saw, or MONTREAL QUEBEC, cAN'imA.

woon-rnnsnnvn'rxvn.

No Drawing.

To all whom it may concern:

Be it known-that I, Jonson A. DE Cnw, of

I the city of Montreal, in the Province of of ferments, fungi and insects, and at the fwithout resultant benefits. By the use of large .to. impregnate the cellular Quebec and Dominion of of the King of' Great Britain, have invented certain new and useful Improvements in Wood-Preservatives, of which the following is a full, clear, and exact description.

This invention relates to wood preservatives, and .has for one of itsobjects to provide a material for the treatment of wood, which will render it resistant to the attack same time harden th wood treated.

In my prior.- 'application *Serial No. 672,760, filed'Jan. 22, 1912, I describe a .product treated with a mixture or material suclr as the one described herein and the mainobj'ect of the present application is 2.0

protect said mixture.

p In the treatment of wood by impregnation with oil, it is necessary to use comparatively large quantitiesof oil and to thoroughly impregnate the fibro-cellular bodies, and a large excess of. oil must remain in the wood this material, the exact amount of oil necessary for reservation is introduced, and this is carried emulsion until the desired depth of penetration is obtained. v

My invention consists essentially in a mixture or' emulsion of suitable quantities of waste sulfite liquor, oil, and a solublesalt .silch as-chlorid of zinc, -iand thismaterial is introduced into a suitable treating tank containing the .wood to betreated'by a suitable injector apparatus.

The preferred method of carrying out my process is to place timber inthe form of boards or the like in a. closed tank and subject the former to a steamingprocess, after which the-steam andl'ail are withdrawn;

from the tank by any suitable means. By withdrawing the air and steam from the material, the wood is, left free to absorb the mixtures or emulsions mentioned. A quantity of waste sulfite liquor and 'crude .oil or creosote .oil with chlorid of zinc, suitably mixed to form an emulsion and sufiiciently cavities of the wood is then introduced into the tank by means of an injector apparatus. The- I Specification of-Letters Patent.

Application filed June 25, 1913. Serial No. 775,793.

Canada, a subject definite soluble salts. Another important function into the wood in the form of an.

Patented Ma 18, 1915.

relative amounts of the preserving materials "may be limited to the desired quantities and may be controlled to meet requirements. The absorption of the emulsion maybe increased by subjecting the contents of the vessel in which the wood is placed to pressure. After the 'mass has been allowed tocool, the excess material is removed. For certain purposes, the operation may be repeated if necessary. As a result of the impregnation and absorption of organic material, the wood is renderedharder, heavier .and stronger.

By introducing waste sulfite liquor, several important results are accomplished. The waste sulfite liquor alone acts as a preservative and hardening medium and being a cheaper material, may replace in part any of the other preservatives used; The most important function, however, of the waste sulfite liquor is to act as an emulsifying agent. Its capacity for forming an emulsion with oil makes it possible to combineproportions of oil with any water of the organic matter 'ofthe waste sulfite liquor, when used with any mixture containing creosote or other oil, is that it greatly reduces the rate of evaporation of the lighter oils from the mixture. Furthermore, there is little pr no waste of the more expensive oil as would result from the .use

of oil alone by reason of the factthat an.

JUDsoN-A. DE OEW. v Witnesses:

STUART RL W. ALLEN,

M. MoRnLnNn. 

